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com.github.pfmiles.org.apache.velocity.runtime.RuntimeServices Maven / Gradle / Ivy

package com.github.pfmiles.org.apache.velocity.runtime;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.    
 */

import java.io.Reader;
import java.io.Writer;
import java.util.Properties;

import com.github.pfmiles.org.apache.commons.collections.ExtendedProperties;
import com.github.pfmiles.org.apache.velocity.Template;
import com.github.pfmiles.org.apache.velocity.context.Context;
import com.github.pfmiles.org.apache.velocity.exception.MethodInvocationException;
import com.github.pfmiles.org.apache.velocity.exception.ParseErrorException;
import com.github.pfmiles.org.apache.velocity.exception.ResourceNotFoundException;
import com.github.pfmiles.org.apache.velocity.runtime.directive.Directive;
import com.github.pfmiles.org.apache.velocity.runtime.log.Log;
import com.github.pfmiles.org.apache.velocity.runtime.parser.ParseException;
import com.github.pfmiles.org.apache.velocity.runtime.parser.Parser;
import com.github.pfmiles.org.apache.velocity.runtime.parser.node.Node;
import com.github.pfmiles.org.apache.velocity.runtime.parser.node.SimpleNode;
import com.github.pfmiles.org.apache.velocity.runtime.resource.ContentResource;
import com.github.pfmiles.org.apache.velocity.runtime.resource.Resource;
import com.github.pfmiles.org.apache.velocity.util.introspection.Introspector;
import com.github.pfmiles.org.apache.velocity.util.introspection.Uberspect;


/**
 * Interface for internal runtime services that are needed by the
 * various components w/in Velocity.  This was taken from the old
 * Runtime singleton, and anything not necessary was removed.
 *
 *  Currently implemented by RuntimeInstance.
 *
 * @author Geir Magusson Jr.
 * @version $Id: RuntimeServices.java 898050 2010-01-11 20:15:31Z nbubna $
 */
public interface RuntimeServices
{

   /**
     * This is the primary initialization method in the Velocity
     * Runtime. The systems that are setup/initialized here are
     * as follows:
     *
     * 

     *   
Logging System
     *   
ResourceManager
     *   
Parser Pool
     *   
Global Cache
     *   
Static Content Include System
     *   
Velocimacro System
     * 
     */
    public void init();

    /**
     * Allows an external system to set a property in
     * the Velocity Runtime.
     *
     * @param key property key
     * @param value property value
     */
    public  void setProperty(String key, Object value);

    /**
     * Allow an external system to set an ExtendedProperties
     * object to use. This is useful where the external
     * system also uses the ExtendedProperties class and
     * the velocity configuration is a subset of
     * parent application's configuration. This is
     * the case with Turbine.
     *
     * @param configuration
     */
    public void setConfiguration( ExtendedProperties configuration);

    /**
     * Add a property to the configuration. If it already
     * exists then the value stated here will be added
     * to the configuration entry. For example, if
     *
     * resource.loader = file
     *
     * is already present in the configuration and you
     *
     * addProperty("resource.loader", "classpath")
     *
     * Then you will end up with a Vector like the
     * following:
     *
     * ["file", "classpath"]
     *
     * @param key
     * @param value
     */
    public void addProperty(String key, Object value);

    /**
     * Clear the values pertaining to a particular
     * property.
     *
     * @param key of property to clear
     */
    public void clearProperty(String key);

    /**
     *  Allows an external caller to get a property.  The calling
     *  routine is required to know the type, as this routine
     *  will return an Object, as that is what properties can be.
     *
     *  @param key property to return
     * @return The value.
     */
    public  Object getProperty( String key );

    /**
     * Initialize the Velocity Runtime with a Properties
     * object.
     *
     * @param p
     */
    public void init(Properties p);

    /**
     * Initialize the Velocity Runtime with the name of
     * ExtendedProperties object.
     *
     * @param configurationFile
     */
    public void init(String configurationFile);

    /**
     * Wraps the String in a StringReader and passes it off to
     * {@link #parse(Reader,String)}.
     * @since 1.6
     */
    public SimpleNode parse(String string, String templateName)
        throws ParseException;

    /**
     * Parse the input and return the root of
     * AST node structure.
     * 


     *  In the event that it runs out of parsers in the
     *  pool, it will create and let them be GC'd
     *  dynamically, logging that it has to do that.  This
     *  is considered an exceptional condition.  It is
     *  expected that the user will set the
     *  PARSER_POOL_SIZE property appropriately for their
     *  application.  We will revisit this.
     *
     * @param reader inputstream retrieved by a resource loader
     * @param templateName name of the template being parsed
     * @return The AST representing the template.
     * @throws ParseException
     */
    public  SimpleNode parse( Reader reader, String templateName )
        throws ParseException;

    /**
     *  Parse the input and return the root of the AST node structure.
     *
     * @param reader inputstream retrieved by a resource loader
     * @param templateName name of the template being parsed
     * @param dumpNamespace flag to dump the Velocimacro namespace for this template
     * @return The AST representing the template.
     * @throws ParseException
     */
    public SimpleNode parse( Reader reader, String templateName, boolean dumpNamespace )
        throws ParseException;

    /**
     * Returns a Template from the resource manager.
     * This method assumes that the character encoding of the
     * template is set by the input.encoding
     * property.  The default is "UTF-8"
     *
     * @param name The file name of the desired template.
     * @return     The template.
     * @throws ResourceNotFoundException if template not found
     *          from any available source.
     * @throws ParseErrorException if template cannot be parsed due
     *          to syntax (or other) error.
     */
    public Template getTemplate(String name)
        throws ResourceNotFoundException, ParseErrorException;

    /**
     * Returns a Template from the resource manager
     *
     * @param name The  name of the desired template.
     * @param encoding Character encoding of the template
     * @return     The template.
     * @throws ResourceNotFoundException if template not found
     *          from any available source.
     * @throws ParseErrorException if template cannot be parsed due
     *          to syntax (or other) error.
     */
    public Template getTemplate(String name, String  encoding)
        throws ResourceNotFoundException, ParseErrorException;

    /**
     * Returns a static content resource from the
     * resource manager.  Uses the current value
     * if INPUT_ENCODING as the character encoding.
     *
     * @param name Name of content resource to get
     * @return parsed ContentResource object ready for use
     * @throws ResourceNotFoundException if template not found
     *          from any available source.
     * @throws ParseErrorException
     */
    public ContentResource getContent(String name)
        throws ResourceNotFoundException, ParseErrorException;

    /**
     * Returns a static content resource from the
     * resource manager.
     *
     * @param name Name of content resource to get
     * @param encoding Character encoding to use
     * @return parsed ContentResource object ready for use
     * @throws ResourceNotFoundException if template not found
     *          from any available source.
     * @throws ParseErrorException
     */
    public ContentResource getContent( String name, String encoding )
        throws ResourceNotFoundException, ParseErrorException;

    /**
     *  Determines is a template exists, and returns name of the loader that
     *  provides it.  This is a slightly less hokey way to support
     *  the Velocity.templateExists() utility method, which was broken
     *  when per-template encoding was introduced.  We can revisit this.
     *
     *  @param resourceName Name of template or content resource
     *  @return class name of loader than can provide it
     */
    public String getLoaderNameForResource( String resourceName );

    /**
     * String property accessor method with default to hide the
     * configuration implementation.
     *
     * @param key property key
     * @param defaultValue  default value to return if key not
     *               found in resource manager.
     * @return String  value of key or default
     */
    public String getString( String key, String defaultValue);

    /**
     * String property accessor method to hide the configuration implementation
     * @param key  property key
     * @return   value of key or null
     */
    public String getString(String key);

    /**
     * Int property accessor method to hide the configuration implementation.
     *
     * @param key property key
     * @return int value
     */
    public int getInt( String key );

    /**
     * Int property accessor method to hide the configuration implementation.
     *
     * @param key  property key
     * @param defaultValue default value
     * @return int  value
     */
    public int getInt( String key, int defaultValue );

    /**
     * Boolean property accessor method to hide the configuration implementation.
     *
     * @param key  property key
     * @param def default default value if property not found
     * @return boolean  value of key or default value
     */
    public boolean getBoolean( String key, boolean def );

    /**
     * Return the velocity runtime configuration object.
     *
     * @return ExtendedProperties configuration object which houses
     *                       the velocity runtime properties.
     */
    public ExtendedProperties getConfiguration();

    /**
     * Return the specified application attribute.
     *
     * @param key The name of the attribute to retrieve.
     * @return The value of the attribute.
     */
    public Object getApplicationAttribute( Object key );

    /**
     * Set the specified application attribute.
     *
     * @param key The name of the attribute to set.
     * @param value The attribute value to set.
     * @return the displaced attribute value
     */
    public Object setApplicationAttribute( Object key, Object value );

    /**
     * Returns the configured class introspection/reflection
     * implementation.
     * @return The current Uberspect object.
     */
    public Uberspect getUberspect();

    /**
     * Returns a convenient Log instance that wraps the current LogChute.
     * @return A log object.
     */
    public Log getLog();

//    /**
//     * Returns the event handlers for the application.
//     * @return The event handlers for the application.
//     */
//    public EventCartridge getApplicationEventCartridge();


    /**
     * Returns the configured method introspection/reflection
     * implementation.
     * @return The configured method introspection/reflection
     * implementation.
     */
    public Introspector getIntrospector();

    /**
     * Returns true if the RuntimeInstance has been successfully initialized.
     * @return True if the RuntimeInstance has been successfully initialized.
     */
    public boolean isInitialized();

    /**
     * Create a new parser instance.
     * @return A new parser instance.
     */
    public Parser createNewParser();

    /**
     * Retrieve a previously instantiated directive.
     * @param name name of the directive
     * @return the directive with that name, if any
     * @since 1.6
     */
    public Directive getDirective(String name);

    /**
     * 同'getTemplate(String arg, String inputEncoding)', 但支持相对路径查找资源
     * @param name 目标路径
     * @param inputEncoding
     * @param curPath 当前基准路径
     * @return 
     */
    public Template getTempSupportRelPath(String name, String inputEncoding, String curPath);

    /**
     * 同'getContent(String arg, String inputEncoding)', 但支持相对路径查找资源
     * @param name 目标路径
     * @param inputEncoding
     * @param curPath 当前基准路径
     * @return
     */
    public Resource getCttSupportRelPath(String name, String inputEncoding, String curPath);

}